Study On Low Costs And High Efficiency Hardfacing Flux-cored Wire

In this paper, a type of flux-cored wire with low costs, high efficiency and large diameter is studied. The medicinal powder of flux-cored wire takes scrap steel as raw material, the author adopts intertwist connection and inner wire to solve technological property of the large diameter flux-cored wire can not meet processing property of the welding requirements.With the improving of equip level of ferrous metallurgy, the production of high purity steels increases rapidly. While the production high purity steels, the amount of coach and plate edges take up to the 4%～5% of gross steel production due to need of length fix, and these steels are seemed as scrap steel to melt down as scrap steel, which will experience the technological process of steel-making, and steel-rolling once again, causing the waste of energy source and the pollution of environment. However the purity of such scrap steel meets the standard of raw material of welding material, and alloy elements in it can be used by welding metallurgy efficiently. This paper makes use of the home-grown scrap steel of steel enterprise, melting the scrap steel into molten steel with medium frequency induction furnace, adding proper amount of alloy elements on the basis of application condition of surface welding material, and manufacturing the molten steel into weld alloy beads by centrifugal atomization. Alloy beads can be deposited on the surface of steel substrate by electric arc, obtaining clad plate with high wear-resistance alloy layer. The shape of the particle is globular shape or spheroidicity, and the dramatic of the particle is 0.1mm～5mm. This paper designs the chromium rich Fe-Cr-C cast-ion big diameter flux-cored wire. The results showed that the structure property of Fe-Cr-C alloy particle high chromium cast-ion deposited metal of large diameter flux-cored wire is studied using optical microscope, TEM, X-ray, and so on. Through the test of grinding abrasion, the wear-resistant ability of deposited metal is measured, and the relationship between carbon equivalent, hardness of deposited metal and wear-resistant ability are analyzed. The results show that the microstructure of the welding metal of big diameter submerged arc flux-cored wire and big diameter open arc surfacing welding flux-cored wire was martensite and residual austenite. The deposited metals have lots of needle shape or sheetlike carbides in matrix, which are mainly composed of residual austenite and martensite. The hardness of deposited metal is higher than 60 HRC, the wear resistance is good.Low cost and high efficient of big diameter flux-cored wire is suitable for submerged arc surfacing and open arc surfacing welding. It has advantages of high deposition efficiency, high hardness, homogeneous microstructure and good wear resistance and so on.Based on the research results, carry out the project test of application on work device of mechanical loader and iron and steel metallurgy enterprises, big diameter flux-cored wire have good effect. The advantages of low cost, high efficient and good wear resistance are made to have a wide application prospect.